This paper presents an overview of the history of Japanese in Colorado. Japanese immigrants first came to Colorado between 1900 and 1910 as railroad laborers. Some became coal miners in southern Colorado; most others became farm laborers. Although the Japanese population during this period was small, communities developed in several locales. The largest was in Denver, and included some small businesses, ethnic churches, and a Japanese newspaper. During the period 1910-1940, the Japanese population in Colorado stabilized at about 2,000. Because they were prohibited from becoming naturalized citizens, the Japanese became self-sufficient within their own business and community organizations. However, they encouraged their children to become educated and to participate in non-Japanese institutions. The Buddhist church and several Japanese newspapers continued to be active in Denver. The period 1940-1970 began with an influx of more Japanese from the West Coast due to white hostility there caused by the outbreak of the war. Despite resistance of white Coloradans to Japanese resettlement in the state, the Denver community grew and many Japanese obtained more professional jobs. Toward the end of the period a third generation of Japanese Americans appeared in the population, and most of the ethnic associations in Denver served the second-generation Japanese instead of their immigrant parents. By the 1970s many Japanese had entered the middle class and were fairly well assimilated into the mainstream culture. Denver no longer has major residential concentrations of Japanese. (AV)